Polyacrylonitrile piezoelectric material, preparation method and application thereof, and flexible piezoelectric nano-generator
A polyacrylonitrile piezoelectric and nanogenerator technology, which is applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., which can solve poor thermal stability and unstable work, etc. problems, achieving good stability, no weight loss, excellent high temperature resistance and flexibility
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[0046] The invention provides a kind of preparation method of polyacrylonitrile piezoelectric material, comprises the following steps:
[0047] The electrospun polyacrylonitrile nanofiber membrane is subjected to programmed heat treatment to obtain a polyacrylonitrile piezoelectric material;
[0048] The programmed heat treatment includes sequentially performing the first heat treatment to the tenth heat treatment, and the temperatures of the first heat treatment to the tenth heat treatment are respectively 50±5°C, 100±5°C, 150±5°C, 200±5°C, 250°C ±5℃, 260±5℃, 300±5℃, 350±5℃, 400±5℃ and 450±5℃;
[0049] When the temperature of the programmed heat treatment is higher than 260° C., the programmed heat treatment is performed in a protective atmosphere.
[0050] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.
[0051] In the present invention, the electrospun polyacrylon...
Embodiment 1
[0063] Dissolve PAN powder (Mw=90000, particle size 100-1000nm) in DMF, then heat at 50°C for 10h to obtain a PAN solution with a concentration of 12% (w / v); use needle-based electrospinning device, electrospinning the PAN solution to obtain an electrospinning nano-membrane; wherein, the working conditions of the electrospinning: the voltage is 22kV, the flow rate of the polyacrylonitrile solution is 0.5mL / h, and the electrospinning distance is 15cm.
[0064] use figure 2 In the shown device, the two ends of the electrospun nano-membrane (with a size of 4cm × 15cm) are fixed on the ceramic support with clamps to ensure that its size does not change during the programmed heat treatment, and then placed in a tubular sintering furnace, The programmed heat treatment is carried out at 0-550°C to obtain a polyacrylonitrile piezoelectric material (referred to as PAN film) with a thickness of 80 μm; the conditions of the programmed heat treatment are as follows image 3As shown, inc...
Embodiment 2
[0066] Prepare the PAN film according to the method of Example 1, and the difference from Example 1 is that in the programmed heat treatment process, the eleventh heat treatment, the eleventh heat treatment, the twelfth heat treatment and the twelfth heat treatment are also included after the tenth heat treatment; wherein , the heating rate of the eleventh heating is 2°C / min, the temperature of the eleventh heat treatment is 500°C, and the time is 30min; the heating rate of the twelfth heating is 2°C / min, and the temperature of the twelfth heat treatment is 550°C , the time is 30min.
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